Device for removing sand by vibration

ABSTRACT

A device for removing sand from a work by vibration which vibrates a molding (work) molded by casting such as an auto part to thereby remove core sand remaining on a hollow portion of the work and in which the work is held against a vibration plate and the vibration plate is vibrated with a single vibration motor to remove the sand. 
     The device for removing sand from a work  1  by vibration which removes sand remaining on the work  1  by vibration, the device comprising a base  3,  a vibration plate  5  mounted on the base  3  via elastic support members  4,  a work holder  6  provided on the vibration plate  5,  and a vibration motor  7  connected to the vibration plate; wherein the work is held with the holder  6,  and the vibration motor  7  is then actuated to vibrate the vibration plate  5,  thereby applying vibration to the work  1  held with the holder  6  to remove the sand from the work  1.

TECHNICAL FIELD

The present invention relates to a device for removing sand from amolding (work) by vibration which vibrates a molding (work) molded bycasting such as an auto part to thereby remove sand remaining on thework, in particular, core sand remaining on a hollow portion of thework. More particularly, it relates to a device for removing sand from awork by vibration which holds a work that is to have sand removedagainst a vibration plate, and vibrates the vibration plate by means ofa single vibration motor, thereby removing sand remaining on the work.

BACKGROUND ART

Many of various machine parts such as auto parts are molded by casting.On moldings (works) produced by casting, a large amount of sand remains.Accordingly, operation for removal of the remaining sand is required.

As methods for removing sand from a work, techniques have heretoforebeen known which comprise striking a work with sand remaining thereon bymeans of a hammer to vibrate the work, thereby removing the sand. Forexample, there have been known a device for removal of sand from a workby holding a work in a sealed box and striking the work with a hammer(Japanese Utility Model Registration No. 3077681), a device forreversion mode removal of sand from a work by reversing a work holdingtable to turn a feeder head portion of a work down and striking the workwith a hammer (Japanese Laid-Open Patent Publication No. 2003-305559),and a hammering device provided with a work-side soundproofing box and ahammer-side soundproofing box to define a sealed room in which a work isstruck with a hammer (Japanese Patent No. 3205897).

However, each of these devices is of a type which removes sand remainingon a work by striking the work with a hammer, and accordingly, has notonly a problem that its size is large but also environmental pollutionproblems of noise and scattering of sand which are caused by thehammering.

Further, there has been disclosed in a patent application filed by thepresent inventor a device which vibrates a work by means of a pair ofvibration motors to remove sand, in particular, core sand in a hollowportion of the work by the vibration force (Japanese Patent ApplicationNo. 2004-243118).

Since the device uses two vibration motors, it is excellent in sandremoving effect by vibration. However, it has a drawback that it islarge-sized and economically disadvantageous because of the use of thetwo vibration motors. Further, when two motors are used, the two motorsshould rotate synchronously. Accordingly, it is necessary to preciselyset proportions of weights of the two motors and positions of elasticsupport members.

Patent Document 1: Japanese Utility Model Registration No. 3077681

Patent Document 2: Japanese Laid-Open Patent Publication No. 2003-305559

Patent Document 3: Japanese Patent No. 3205897

Patent Document 4: Japanese Patent Application No. 2004-243118

DISCLOSURE OF INVENTION Problem to be Solved by the Invention

The problem to be solved by the present invention is to provide a devicefor removing sand by vibration which effects removal of sand from a workby vibrating the work characteristically using a single vibration motorinstead of a conventional technique for removing sand by striking a workwith a hammer, thereby realizing, as a matter of course, size reduction,and being capable of eliminating noise caused by hammering and ofpreventing environmental pollution due to scattering sand caused by thehammering and further capable of solving the problems inherent in caseswhere two motors are used, and accordingly, which is so improved as tobe capable of solving the drawbacks inherent in the conventionaltechniques.

Means to Solve the Problem

To solve the above-described problem, according to the presentinvention, there is provided a device for removing sand from a moldingby vibration which removes sand remaining on the molding by vibration,the device for removing sand by vibration comprising:

-   -   a base;    -   a vibration plate mounted on the base via elastic support        members;    -   a molding holder provided on the vibration plate; and    -   a single vibration motor connected to the vibration plate;    -   wherein the molding which is to have sand removed is held with        the holder, and the vibration motor is then actuated to vibrate        the vibration plate, thereby applying vibration to the molding        held with the holder to remove the sand from the molding.

EFFECT OF THE INVENTION

The above-described present invention is so constructed that a workwhich is to have sand removed is held against a vibration plate, and thevibration plate is vibrated by means of a single vibration motor tothereby remove sand remaining on the work, in particular, core sand in ahollow portion. Accordingly, the device of the present inventionrequires no large constituent such as a hammering chamber in aconventional technique and thus enables size reduction to be realized,and is free from noise caused by hammering, and causes no environmentalpollution due to scattering of sand.

Further, since the device of the present invention is provided with theonly one vibration motor, it enables size reduction to be realized andis economically advantageous. In a case where a sand removing deviceuses two motors, the two motors are required to rotate synchronously,and accordingly, it is necessary to precisely set proportions of weightsof the two motors and positions of elastic support members. However, thedevice provided with the single motor is free from such a restriction.

BEST MODE FOR CARRYING OUT THE INVENTION

In the following, the present invention will be described with referenceto the accompanying drawings. FIG. 1 is a plan view of an embodiment ofthe device for removing sand by vibration according to the presentinvention. FIG. 2 is a side view of the embodiment of the device. FIG. 3is a perspective view of the embodiment of the device.

As shown in FIGS. 1, 2 and 3, the present invention is a device A forremoving sand from a molding (work) 1 by vibration which removes coresand in a hollow portion 2 of the molding (work) 1 by vibration, andwhich comprises a base 3 and a vibration plate 5 mounted thereon viaelastic support members 4. On the vibration plate 5, a work holder 6 forholding the molding 1 therebetween is provided. Further, the vibrationplate 5 is connected to a single vibration motor 7. As examples of theelastic support members 4, which isolate vibration toward a floor andprevent hindrance of vibration transmission to the vibration plate,there may be mentioned rubber supports, metal springs, pneumatic springsand the like.

In the device A for removing sand by vibration according to the presentinvention which is constructed as described above, when sand is removed,first, air is discharged from the work holder 6 which inflates with airto deflate the work holder. A clamp rod 9 is thereby retracted through awork clamp guide 8 to provide a space for inserting the work 1, as shownin FIG. 4.

Subsequently, the work 1 is placed in the space formed by the dischargeof air, and then air is introduced into the work holder 6 to inflate thework holder, thereby pressing the work 1 with a press means 10 providedat the tip of the clamp rod 9 to hold the work 1 with the work holder 6,as shown in FIG. 5.

After the work 1 is held with the work holder 6 in this manner, thesingle vibration motor 7 connected to the vibration plate 5 is actuatedto vibrate the vibration plate 5, thereby applying vibration to the work1 to remove sand remaining on the work 1, in particular, core sand inthe hollow portion 2. In this connection, in a case where core sand isshaken out of the hollow portion 2, if solid grains are placed in thehollow portion 2 of the work 1, the removal can be effected efficiently.

INDUSTRIAL APPLICABILITY

The above-described present invention is so constructed that a workwhich is to have sand removed is held against a vibration plate, and thevibration plate is vibrated by means of a single vibration motor tothereby remove sand remaining on the work, in particular, core sand in ahollow portion. Accordingly, the device of the present inventionrequires no large constituent in a conventional technique such as ahammering chamber and thus enables size reduction to be realized, and isfree from noise caused by hammering, and causes no environmentalpollution problem due to scattering of sand.

Further, since the device of the present invention is provided with theonly one vibration motor for vibrating the vibration plate, it iseconomically advantageous and has a simplified structure and enablessize reduction to be realized. In other words, the device of the presentinvention is provided with the only one motor. On the other hand, in acase where a sand removing device is provided with two motors, the twomotors are required to rotate synchronously, and accordingly, it isnecessary to precisely set proportions of weights of the two motors andpositions of elastic support members. However, the device provided withthe single motor is free from such a restriction. Accordingly, thedevice for removing sand by vibration according to the present inventionhas high potential that it will be used widely in the field of castingtechnique.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of an embodiment of the device for removing sandby vibration according to the present invention.

FIG. 2 is a side view of the device shown in FIG. 1.

FIG. 3 is a perspective view of the device shown in FIG. 1.

FIG. 4 is an illustrative view showing a state before a work is clamped.

FIG. 5 is an illustrative view showing a state after the work isclamped.

NOTE ON REFERENCE NUMBERS

A: device for removing sand from a molding by vibration

1: work

2: hollow portion

3. base

4. elastic support member

5. vibration plate

6. work holder

7. vibration motor

8. work clamp guide

9. clamp rod

10. pressing means

1. In a device for removing sand or core sand from moldings or in ahollow portion of the moldings by vibration which removes sand remainingon the molding said device for removing sand by vibration comprisingbase, a vibration plate mounted on the base made of elastic supportmembers, a molding holder provided on the vibration plate, and avibration motor directly connected to the vibration plate, wherein themolding which is to have sand to be removed is held with the holder,characterized in that: the vibration motor is a single vibration motorand is actuated to vibrate the vibration plate, thereby applyingvibration to the molding held with the holder to remove the sand fromthe molding.
 2. The device for removing sand by vibration according toclaim 1, wherein solid grains are placed in the hollow portion of themolding to facilitate the removal of the core sand in the hollowportion.